Shaft Gear to Top Cover for Mercruiser 74-90 #1 R MR Alpha 45-55796

Vertical Driveshaft used on a Mercruiser Sterndrive. This is what the driven gear rides on, and goes between the gear and top cover bearing. Many people think this is part of the driven gear but it is actually pressed into the driven gear. It will fit the following application(s): All MC-1/R/MR/Alpha One. This item replaces Mercury Quicksilver # 45-55796.